#include "usart.h"

char USART_RXBUF[28];

uint8_t RXOVER = 0;
uint8_t RXCUNT = 0;

void USART_Config(int bound)
{
	GPIO_InitTypeDef GPIO_InitStructure;      //在GPIO_Init函数调用时需定义一个GPIO_InitTypeDef结构体类型变量
  USART_InitTypeDef USART_InitStructure;  //USART_Init函数调用时需定义一个USART_InitTypeDef结构体类型变量
  NVIC_InitTypeDef NVIC_InitStructure;    //USART_Init函数调用时需定义一个NVIC_InitTypeDef结构体类型变量

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);	//使能USART1，GPIOA时钟

	//USART1_TX   GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9

  //USART1_RX	  GPIOA.10初始化
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10  

  //Usart1 NVIC 配置
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3  
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;      //子优先级3
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;		  //IRQ通道使能
  NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器

   //USART 初始化设置
   USART_InitStructure.USART_BaudRate = bound;//串口波特率
   USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
   USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
   USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
   USART_InitStructure.USART_HardwareFlowControl =  USART_HardwareFlowControl_None;//无硬件数据流控制
   USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式
   USART_Init(USART1, &USART_InitStructure); //初始化串口1
   USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接中断
   USART_Cmd(USART1, ENABLE);                    //使能串口1   
}


void USART_SendString(int8_t *str)
{
    uint8_t index = 0;
    do
    {
        USART_SendData(USART1,str[index]);
        while(USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET);
        index++;  
    }
    while(str[index] != 0); 
    
}

void USART1_IRQHandler(void)
{
	uint8_t temp;
	if(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET)
	{
		USART_ClearITPendingBit(USART1,USART_IT_RXNE);		
		temp = USART_ReceiveData(USART1);
		if(temp == '!' || RXCUNT==20)
		{
			RXCUNT = 0;
			RXOVER = 1; 
			USART_ITConfig(USART1,USART_IT_RXNE,DISABLE);
		}
		else
		{
			USART_RXBUF[RXCUNT] = temp;
			RXCUNT++;			
		}
	}
}

int fputc(int ch,FILE *f)
{
	USART_SendData(USART1,(unsigned char)ch);
	while(! (USART1->SR & USART_FLAG_TXE) );
	return ch;
}
	
